This class is defined in the \fBQt ActiveQt Extension\fR, which can be found in the \fCqt/extensions\fR directory. It is not included in the main TQt API.
The functions provided by this class allow an ActiveX control to communicate property changes to a client application. Inherit your control class from both TQWidget (directly or indirectly) and this class to get access to this class's functions. The meta object compiler requires you to inherit from TQWidget \fIfirst\fR.
When implementing the property write function, use requestPropertyChange() to get permission from the ActiveX client application to change this property. When the property changes, call propertyChanged() to notify the ActiveX client application about the change. If a fatal error occurs in the control, use the static reportError() function to notify the client.
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Use the interface returned by clientSite() to call the ActiveX client. To implement additional COM interfaces in your ActiveX control, reimplement createAggregate() to return a new object of a QAxAggregated subclass.
Reimplement this function when you want to implement additional COM interfaces in the ActiveX control, or when you want to provide alternative implementations of COM interfaces. Return a new object of a QAxAggregated subclass.
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The default implementation returns the null pointer.
Reports an error to the client application. \fIcode\fR is a control-defined error code. \fIdesc\fR is a human-readable description of the error intended for the application user. \fIsrc\fR is the name of the source for the error, typically the ActiveX server name. \fIcontext\fR can be the location of a help file with more information about the error. If \fIcontext\fR ends with a number in brackets, e.g. [12], this number will be interpreted as the context ID in the help file.
Call this function to request permission to change the property \fIproperty\fR from the client that is hosting this ActiveX control. Returns TRUE if the client allows the change; otherwise returns FALSE.
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This function is usually called first in the write function for \fIproperty\fR, and writing is abandoned if the function returns FALSE.
